<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <title>...</title>
    <style type="text/css">
        h1{
            color:blue;
            font-size:30px;
        }
    </style>
    <link rel="stylesheet" type="text/css" href="css/2.css" />
</head>
<body>
    <p style="font-size:40px;color:red;">这是段落标记的内容</p>
    <h1>这是标题1的内容</h1>
    <h2>这是标题2的内容</h2>
</body>
</html>